HTML5 video disablepictureinpicture?

I'm adding a HTML5 video to a website and want to disable the dreadful pictureinpicture option which seems to be enabled by default.

If I look at the video attributes I see the following listed..

poster width height disablepictureinpicture controlslist controls

I have set the poster to the image I want displayed before playing, width is 100%, height to auto, disablepictureinpicture, controlslist and controls are blank/empty

Having 'disablepictureinpicture' would suggest that this is an option, I've setting the value to 'true' and 'yes' but that annoying picture in picture icon still appears when you hover over the video.

For ref. I'm testing this in FireFox 73.0.1 (64 bit)

Is there something I'm missing?

Thanks in advance

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